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Problem downloading program through DTU modem

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I have a V350 on the field. The PLC is connected to the internet with a DTU modem which acts like an IP to Serial bridge. The DTU is a transparent serial bridge betaween my computer at the office and the PLC on the field.
On my comuter I have a virtual com port which directs all the communication to the serial port of the DTU whcihis connected the COM1 of the V350.
I have no problems reading data from the V350 using my SCADA software.
But when I try to download a new software using Visilogic. If there is a communication error with the V350 during the download, the Visilogic is trying to "Reconnect" at this time I see that the V350 communication speed changes from 38400 to 57600!
After monitoring thecommunication I found out the when the Visilogin is "retrying"is actually send the following command to the V350:  "/00CPC1T0AFFFF44". This command causes the V350 to change baud rate.
The problem is the if the V350 changes its baud rate the DTU doesnt! So i cant communicate remotlley with the V350.

How can I prevent the Visilogic from chnaging the V350 baud rate?
By the way the same problem exists with U90 and Jazz controllers.
Best regards,
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